Abstract
Magnetite (MG) modified cellulose membrane (Cell-MG), obtained by reaction of 3-aminosilane and subsequently with diethylenetriaminepentaacetic acid dianhydride functionalized waste Cell fibers (Cell-NH2 and Cell-DTPA, respectively), and amino-modified diatomite was used for Azoxystrobin and Iprodione removal from water. Cell-MG membrane was structurally and morphologically characterized using FT-IR and FE-SEM techniques. The influences of operational parameters, i.e. pH, contact time, temperature, and the mass of adsorbent on adsorption and kinetics were studied in a batch system. The calculated capacities of 35.32 and 30.16 mg g-1 for Azoxystrobin and Iprodione, respectively, were obtained from non-linear Langmuir model fitting. Weber-Morris model fitting indicates the main contribution of intra-particle diffusion to overall mass transport resistance. Thermodynamic data indicate spontaneous and endothermic adsorption. The reusability of adsorbent and results from wastewater purification showed that Cell-MG could be used as general-purpose adsorbent. The adsorbent/adsorbate surface interaction was considered from the results obtained using density functional theory (DFT) and calculation of molecular electrostatic potential (MEP). Thus, a better understanding of the relation between the adsorption performances and contribution of non-specific and specific interactions to adsorption performances and design of novel adsorbent with improved properties was deduced
Highlights
Aquatic environmental pollutions due to the presence of heavy metal ions and toxic organic compounds in wastewater, is a major environmental concern
The adsorbent/adsorbate surface interaction was considered from the results obtained using density functional theory (DFT) and calculation of molecular electrostatic potential (MEP)
The moderate adsorption removal from model water, calculated according to non-linear Langmuir model fitting, and wastewater from the mining industry with exceptional high desorption efficiency indicate the moderate performance of Cell-MG membrane for selective pesticide removal
Summary
Aquatic environmental pollutions due to the presence of heavy metal ions and toxic organic compounds in wastewater, is a major environmental concern. Heavy metals are serious chemical pollutants because of their persistence in the environment, toxicity, and bioaccumulation. In the modern-day intensive agricultural industry, the use of pesticides is unavoidable and very common, in order to optimize the food protection process required by the growing human population. A small percentage of applied pesticides reach the target organism and it is considered that all residues entering waters and soils. Aquatic pollution caused by pesticides as a consequence of run-off, leaching, and sub-surface drainage, may pose a serious health hazard for living being and ecosystems due to pesticides persistent nature and biomagnification [3]. Since most organic pesticides are non-degradable and carcinogenic, they represent a potent category of water contaminants
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